Abstract
Scalable quantum information processing will require quantum networks of qubits with the ability to coherently transfer quantum states between the desired sender and receiver nodes. Here we propose a scheme to implement a quantum router that can direct quantum states from an input qubit to a preselected output qubit. The path taken by the transferred quantum state is controlled by the state of one or more ancilla qubits. This enables both directed transport between a sender and a number of receiver nodes, and generation of distributed entanglement in the network. We demonstrate the general idea using a two-output setup and discuss how the quantum routing may be expanded to several outputs. We also present a possible realization of our ideas with superconducting circuits.
Highlights
We present a possible realization of our ideas with superconducting circuits
The transfer of quantum information between different quantum processing units will be an integral part of possible future quantum technology
State transfer protocols in such networks typically rely on tuning nearest-neighbor couplings and local fields, either statically or dynamically, in order to maximize the fidelity of moving a quantum state across the network in minimum time
Summary
The transfer of quantum information between different quantum processing units will be an integral part of possible future quantum technology. Since a larger quantum processing unit is likely to consists of several smaller devices or subprocessors, it is crucial to have a quantum routing system for selective high-fidelity state transfer and entanglement sharing between a sender and a distinct receiver in a network This issue has previously been considered in several different contexts, including coupled harmonic systems [24], external flux threading [25], local field adjustments in spin systems [26,27,28,29,30,31], using local periodic field modulation [32] to manipulate tunneling rates [33,34,35,36], and using optimal control techniques at local sites [30].
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